Desing Concepts of Formwork for RCC Dams
One of the main distinctive aspects of the construction of Roller Compacted Concrete (RCC) dams compared with Conventional Vibrated Concrete (CVC) dams is the continuous placement in a single block at high raising rates. The traditional formwork used for forming the faces of CVC dams is not suitable for this continuity and some major modifications need to be implemented in its design in order to adapt the forms to the particular requirements of RCC dams. The specification of the finish and tolerances within design lines of the RCC dam face are in most cases similar to those that were traditionally applied in CVC dams. However forming the faces of RCC dams can become more critical, not just because of the speed of construction, but also due to the high level of set retardation used in some RCC mixes and relatively low early strength of the concrete. This aspect is discussed in the paper as it has a great influence in the design of the anchoring systems of the formwork. Some other specific factors affecting the design of formwork for RCC dams are presented in this paper. This analysis is based on the experience of using formwork of different types to form the faces of RCC dams during the past 20 years. Some case studies are described and some lessons learned over this period of time are also presented. Finally some recommendations for the design of formwork for RCC dams for both vertical and stepped faces are included, and as conclusion of this experience, a conceptual design for this kind of forms is proposed. This article is of particular interest for contractors and suppliers of formwork as RCC dams have become with the time the most popular way of building concrete dams.
RCC dam construction formwork dam faces anchor
Ortega S., Fosce
Spanish National Committee on Large Dams
国际会议
第五届碾压混凝土坝国际研讨会(The Fifth International Symposium on Roller Compacted Concrete(RCC))
贵阳
英文
125-130
2007-11-02（万方平台首次上网日期，不代表论文的发表时间）